The Ars Technica article Vice President may tell NASA to accelerate lunar landings ends with:
And on Thursday, NASASpaceFlight.com reported that the agency is considering skipping a critical test that is part of the large Space Launch System rocket's development plan. Before the first rocket launches, NASA had planned to send the entire core stage of the rocket, with its four engines, to Stennis Space Center for a "Green Run" test firing, including an eight-minute burn that would mimic the rocket's ascent into orbit. This process would have taken about six months.
Now, the agency is considering whether to skip that test entirely in favor of just a short, five-second test firing on the launchpad at Kennedy Space Center. This would increase the risk of some kind of problem during launch but shave as much as six months from the development timeline. This is another indication of the Trump administration's desire to assess all avenues for accelerating NASA's spaceflight programs.
Question: Why would an 8-minute burn result in a 6-month delay? Or am I oversimplifying and/or misunderstanding?